
Originally Posted by
Suiram
My understanding is that sleep duration is a function of INT. If your sleep only lasted 75% of what you are accustomed to, perhaps it wasn't a resist, but rather that in your full enfeebling gear you have insufficient INT for max duration from an unresisted sleep on that particular enemy.
Sleep duration is fixed for each spell. Sleep 1 is 60 seconds and sleep 2 is 90 seconds, for example. If you see a result less than that it's because of a partial resist.
Int may come in to play determining that level of resistance, but it certainly doesn't increase the possible duration, and neither do elemental staves or weather effects.